Crossword Genius

Army finally advance at regular intervals (6)

Ross

I believe the answer is:

yearly

I'm a little stuck... Click here to teach me more about this clue!

'at regular intervals' is the definition.
I can't tell whether this definition defines the answer.

'army finally advance' is the wordplay.
'finally' indicates one should take the final letters.
'advance' becomes 'early' (similar in meaning).
The last letter of 'army' is 'y'.
'y'+'early'='YEARLY'

Can you help me to learn more?

(Other definitions for yearly that I've seen before include "A hundred times a century" , "Happening every twelve months" , "Perennial" , "on a regular basis" , "like circulation of the Sun?" .)

I've seen this clue in The Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.